Journal
INTERMETALLICS
Volume 17, Issue 10, Pages 835-839Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2009.03.012
Keywords
Glasses, metallic; Fracture toughness; Mechanical properties, theory
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The deformation and fracture response of a bulk metallic glass (BMG) post-annealing above the glass transition temperature is examined. The toughness of the glass-matrix composite exhibits a sharp transition beyond a critical volume fraction of crystallization to values as low as that of brittle silicate glass. Instrumented indentation tests supplemented by impact tests were used to study this ductile to brittle transition exhibited by the partially crystallized samples. Indentation on the anneal-embrittled specimens shows lateral cracks in addition to cracks along the corners. The applicability of the Poisson's ratio-toughness correlation with respect to partially crystallized samples is also investigated. (C) 2009 Elsevier Ltd. All rights reserved.
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